Curved printing-plate.



J. S. DUNCAN. CURVED PRINTING PLATE. APPLICATION FILED JULY 5. I913.

Patented Nov. 7, 1916.

wiz aaea' AT; PATENT o JOSEPH S. DUNCAN,

F CHICAGO, ILLINOIS,

OF CHICAGO, ILLINOIS, ASSIGNOR '10 ADDRESSOGBAPH COMPANY,

A'CORPORATION OF ILLINOIS.

cUnvED PRINTING-PLATE.

Specification of Letters Patent.

Application filed my 5, 1913. Serial n. 777,414.

To all whom it may concern:

Be it known that I, J OSEPH S. Duncan, a citizen of the United States, residing at Chicago, in the county of Cook and State .of Illinois, have invented certain new and useful Improvements in Curved Printing-Plates,

of which the following is a specification.

its length transversely This invention relates in general to printto sheet metal plates on which the printing characters are struck up from the body of the metal in close simulation of typiewriting characters. v I

One of the primary objects of the invention is to provide a printing plate of this character which will be curved throughout to .the lines of printing characters thereon to conform tothe curvature of an impression cylinder adapted to have a series of such plates secured thereon in close juxtaposition to produce a complete printing form adapted to print a form letter at one operation of the cylinder.

To facilitate an understanding of my invention I have illustrated one embodiment of the same on the accompanying drawings to which the following description relates.

Referring to the drawings-Figu1'e 1 is a plan view of a printing plate embodying my invention; Fig. 2 is an end view thereof; and Fig. 3 is an enlarged fragmentary view taken transversely of the plate.

From the drawings it will be observed that my invention comprises a plate 5, preferably made of sheet metal of suflicient len h to accommodate lines of printing characters of of printing characters designate ence character 6 are stamped up fr body of the metal by any suitable machine such, for instance, as a graphotype. downwardly projecting flange 7 is formed along one longitudinal edge of the plate, said flange being adapted to engage in a suitable recess or channel formed in the face of an impression cylinder to which the plates 7 plate.

ing application Serial No. 777 ,415; filed July 5,1913, preferably after the printing characters have been stamped up on t e plate.

In order that 'sion may be made by the full face of eac printing character, it is essential-that the printing face of the character be flat. With this end in view the plate is curved or bent only between the lines of printing characters at the point 8, withthe result that the printing faces of the characters are left perfectly flat, each face being disposed tangentiall a curve concentric with the center of curvature of the plate. A clear and distinct impression may, therefore, be made from the flat printing face of each character.

As has been previously stated, a number of plates constructed as above described are secured in juxtaposition upon the surface 0 an impression cylinder to produce a complete letter form and, in order spacing throughout the form may be uni.- form, the lines of characters are struck up quite close to the longitudinal edges of each In other words, the aggregate disthe longitudinal marglns of a lines of a clear and distinct imprestances that plate project beyond the marginal printing characters tance between adjacent lines of characters on the plate. When the plates are then assembled on an impression cylinder it will be manifest that the spacing between the marginal lines of adjacent plates will be equal to' the spacing between the lines on the plates, so that uniform line spacing throughout the form will be secured.

I claim:

Patented Nov. 7,1916.

that the line A sectional printing'element, comprising a metal sheet of relatively narrow w1 t provided with a rearwardly extending flange g one longitudinal edge, and a plurality of longitudinally extending lines of flattween said lines of printing whereby said plate is curved and the printing faces of said pri ting characters are disosed in planes tangential to a curve concentric to the curgature of said plate.

OSEPH S. DUNCAN. Witnesses:

IRA J. WILSON,

M. A. Knmm. 

